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"To confirm that NPM is phosphorylated by v-cyclin on Thr199 in our experiments, U2OS cells were transfected with expression vectors for Myc tagged v-cyclin or a vector control together with eGFP tagged wild-type NPM (eGFP-NPM), or its phosphorylation site mutant T4A, with threonine to alanine mutations of NPM codons of 199, 214, 234, 237, and mutant T3A in which all but threonine 199 is replaced by alanine XREF_BIBR."